Mural Arts Month: Roots & Risk . At Mural Arts Philadelphia, risk is in our roots. Since day one, over three decades ago, we’ve never turned away from a challenge ...
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A water clock or clepsydra (Greek κλεψύδρα from κλέπτειν kleptein, 'to steal'; ὕδωρ hydor, 'water') is any timepiece in which time is measured by the regulated flow of liquid into (inflow type) or out from (outflow type) a vessel where the amount is then measured.
